The newest in our series segment Hands-On, where we focus on different parts of the hand from fingertip to wrist. Today we're talking thumbs. A digit, but not technically a finger, whose opposable nature gives us advantage over most other mammals, but doesn't mean it's safe from arthritis. We will talk to Dr. Janz about Basal Thumb Arthritis, what it is, what it means, its symptoms and treatments.